Portable polisher and grinder



C. CAMPBELL. PORTABLE POLISHER AND GRINDER.

Patgnted Mar. 16, 1920.

' APPLICATlON HLED OCT. 31,1918- INVENTOR- CouN CAMPBELL,

l HORNE Y8 UNITED srarns PATENT orrron.

I 0013112 ('JAZM'JPBE ILL, OF RUTHERFORD, NEW JERSEY.

PORTABLE POLISHED AND GRINDER.

Specification of Letters latent.

Patented Mar. 16, 1920.

Application filed October 31. 1818. Serial No. 280.566.

To all whom it may concern? Be it known that I Gonna CAMrnanL, a citizen of the United tates, and a resident of Rutherford, inthe county of Bergen and State of New Jersey, have invented a new and Improved Portable Polisher and Grinder, of which the following is a full, clear,.and exact description.

This invention relates to grinding and polishing machines and. has for an oblect the provision of an improvedconstruction which may be used on a stationary stand or used as a-movable grinder.

Another object in view is to provide a polisher and grinder especially adapted for boiler heads headers and the like, the struc ture being such that the grinding surface will automaticall adapt itself to the slant of the article being ground;

it. further object of the invention is the provision of a grinding member having a supporting dish and a loose power connection whereby the disk may be supported on the article being ground while the grinding surface conforms to the slant of the surface to be ground without affecting the power transmission.

In the accompanying drawing:

Figure 1 is a longitudinal vertical section through a polisher and grinder embodying the invention, the same being shown in position for grinding a boiler head.

Fig. 2. is a fragmentary sectional view through Fig. l on line 2-2.

Fig. 3 is a fragmentary top showing the arrangement of the clamping ring.

In preparing boiler heads, headers and other articles with smooth finished surfaces for receiving tions it is desirable to adjust the tool so as to fit flatwise against the article being ground and polished. In cases where the tool is rigid and also the boiler or other article more of the material must be ground away in order to produce a proper smooth bearing surface. In the present invention means have been provided which may be used as a stationary grinder or a grinder which may be applied to any-desired article.

In Fig.1 a sheet 1 is shown with an open ing 2 on which it is desired to form a seat for a cap, plug or other article. it is customary to grind the surface of the plate 1. The grinding member 3 is shown n Fig. 1 as being applied to a plate 4, said plan view caps or other tight connec-- against the plate To do this grinding member being emery paper, cloth or other grinding material which is preferably removably connected with plate 4. The grindin or abrading member consists of a sheet w ich is preferably held in place by ring 22 resting against the edge of the sheet for forcing said edge against the plate at in Fig. 1 on the plate t in Fig. 3. In orderto hold the ring 22 in proper place the same is provided with a number of overlapping lugs 23 adapted to be. passed through the aperture 24 of either plate l or 4: when the ring is placed in position and then turned to engage one. of the cam faces 25 or 26 as desired. These cam faces are on the bottom of the plate and are arranged on opposite sides of the various notches 24: (Fig. 1) in order to cause a proper clampmg of ring 22 regardless of the direction of rotation of the plate l. By providing the clamping ring 22 the entire surface of the abrading member '3 may be used except the extreme outer edge which is engaged by the ring. Plate 4 is any desired material, as for instance cast iron, said plate being formed with a hub 5 having a square bore 6 therein; This square bore accommodates the head 7 of a bolt 8 and also the square head 9 of the shaft 10. This head 9 is loosely mounted in the bore 6 as shown in Fig. 2 whereby the plate 4 may move substantially in any direction to adjust itself to the surface of plate 1, and at the same time rotate by power transmitted from the head 9. The shaft 10, which is preferably formed integral with head 9, is secured to a power member 11 of any desired kind so that this power may be fixed or rigid and also the shaft 10 and head 9 may be rigid, while the plate l is arranged at any slight angle thereto which may be necessary. Itwill be observed that pressure may be brought to bear on the plate 4: by moving .the power memher 11 so that the head 9 of shaftlO will press against the head 7 of bolt 8. In order to provide a proper support for the plate at and associate parts bolt 8 carries a washer 12 which clamps "the abrasive matter 3 4. This washer is provided with an extension 13 against which the bearing structure 14 presses when the nut 15 is screwed down tight. Resting on the outer part of the ball bearing structure plate 4 and associated parts.

forms of drivin to the hub 5. TE

sired, and by reason placed in the position shown in Fig. l and the power turned on. More or less ressure is also exerted for causing the a rading member to. properly grind and polish the surface against which it operates. By reason of the disk 16 no power need be used for supporting the parts 1n place while they are always held so positioned as to produce a grinding at the right place. The head 9 1s insertible through the end of the hub and is locked in place by a guiding coupling member 18 which is held in place by a s eeve 19. The coupler 18 is provided with lu fitting into suitable notches in the hub 5 so that it is looked in a given position when the sleeve 19 is tightened. This will positively connect the shaft 10 but allow a certain amount of independent movement of the The arrangement of members 10, 18 and 19 are such that the shaft 10 maybe quickly removed and a different form substituted, as for instance one with a tapering shank whereby different means may be connected e construction is such that the polisher and grinder is easily moved from place to place and quickly and easily adjusted to accommodate a power driven member or a hand operated member. It is also easily applied to difierent parts of a boiler head or other article Whenever deof the loose connection of certain parts it will automatically conform to the surface to be ground.

In Figs. 3 and 4 will be seen a slight modified form of the structure which is used on a stationary shaft 21, said shaft if desired, having a coupling 20. In this form of the invention the members 12 and 16 and tion as in the associate parts are removed including bolt 8 so as to provide an even surface throughout whereby the face, or hand-hold ca s, nuts and the like may be quickly and easily ground. In this for of the invention the members 18 and 19 are the same construcpreferred form, though preferably the interior member 18 is threaded for receiving a threaded auxiliary shaft 21. It is, of course, evident that other connecting means may be used Without departing from the spirit of the invention.

at I claim is:

1. A grinding and polishing machine comprising a plate having a hub, an abrading member on the plate, a bolt extending through the plate, a supporting disk rotatably mounted on the bolt, and a power member connectedwith said hub, in such a manner as to allow the hub and late a slight wabbling motion to permit se f-adjustment of the abradin member to the surface against which tie abrading material opcrates.

2. A grinding and polishing machine comprising a fiat disk having a hub with a square socket therein, an abrading member to one face of said disk, means for rotating said disk, said means including a shaft having a square head loosely fitting in said socket whereby the disk may rotate in a plane which is at an oblique angle to the axis of said shaft, a bolt extending from said disk, and a support for the disk adapted to engage a stationary bod while the disk is rotated, said bolt exten ing through said support and journaled therein.

COLIN CAMPBELL.

means for clamping I 

